Interesting. I have an unpublished blog exploring the 5 models, plus a couple of new ones, extending them from magical practise into the research of strange phenomena. I also believe that some magicians in the DMKU use the term 'model 6' for something or other. I haven't read the article discussing that yet because it appears in Liber LS Volume 2 and I only have volume 1 and 3 at the moment.